Fix error with wrong spigot versioning

Author: Shweit

pom.xml

@@ -3,7 +3,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.example</groupId>
   <artifactId>MinecraftServerAPI</artifactId>
-  <version>1.21.x</version>
+  <version>1.20.x</version>
   <name>MinecraftServerAPI</name>
 
   <properties>

src/main/resources/plugin.yml

@@ -6,7 +6,7 @@ author: Shweit
 contributors:
   - Shweit
   - Flix-29
-api-version: 1.20
+api-version: '1.20'
 softdepend:
   - Maintenance